A lapel microphone or lavalier (or lav mic) is a small electret or dynamic microphone used for television, theatre, film and public speaking applications, in order to allow hands-free operation.

They are most commonly provided with small clips for attaching to collars, ties, or other clothing. The cord may be hidden by clothes and either run to a radio frequency transmitter in a pocket or clipped to a belt (for mobile work), or directly to the mixer (for stationary applications).